Intro to Fireball...... anybody who saw Purple open with this last year (or in 96) will know what I'm talkign about

Other than that, I'd say Vai's "the audiance is listening".... really inventive, funny, and effective.

Also, Lyenard Skynard, Freebird. That song builds up like nothing else, starts with a beautiful piano, slide guitar thing.....

I also quite like the into to Richard III, but I can't count songs I'm writting at the moment can I